CN108091751B - A kind of white light LED device and preparation method thereof, LED lamp - Google Patents

Abstract

The invention discloses a white light LED device, a preparation method thereof, and an LED lamp, wherein the white light LED device comprises: a bracket, a blue light emitting chip arranged on the bracket, and a fluorescent glue covering the blue light emitting chip; Phosphors, yellow-green phosphors, red phosphors, blue phosphors, yellow-green phosphors, and red phosphors are uniformly mixed in the fluorescent glue according to a preset ratio; the emission peak wavelength range of the blue phosphors is 470nm-520nm; The emission peak wavelength range of the yellow-green phosphor is 520nm-560nm; the emission peak wavelength range of the red phosphor is 600nm-680nm. The set fluorescent glue contains blue phosphor, yellow-green phosphor and red phosphor. The fluorescent glue has a strong absorption effect on the blue light emitted by the blue light-emitting chip, so as to reduce the harm of blue light, and at the same time ensure that the light emitted by the white LED device has the Continuous luminescence spectrum.

Description

A kind of white light LED device and preparation method thereof, LED lamp

technical field

Embodiments of the present invention relate to the technical field of LED packaging, and in particular, to a white light LED device, a preparation method thereof, and an LED lamp.

Background technique

Light Emitting Diode (LED) is a solid-state semiconductor device that can directly convert electricity into light. Because LEDs are mercury-free, small in size, long in life, fast in response, environmentally friendly, energy-saving, and have high color saturation, their applications are becoming more and more widespread, especially white LEDs, which are considered to be the second most popular after incandescent and fluorescent lamps. The third generation of lighting sources in the future are widely used in liquid crystal projection devices, mobile phone backlights, and display screens.

At present, there are many technologies for realizing white light LEDs, one of which is to use blue LED chips with yellow-green phosphors, or blue LED chips with mixed phosphors of yellow-green phosphors and red phosphors, to generate white light. That is, the blue light emitted by the blue LED chip excites the phosphor to emit yellow-green fluorescence, or stimulates the mixed phosphor to emit a mixed fluorescence of yellow-green and red, and the yellow-green light or mixed fluorescence is combined with another part of the blue light transmitted through the phosphor to form white light.

However, the white light emitted by the white LED generated in the above scheme has a discontinuous spectrum, there is a spectrum loss phenomenon between 480-500 nm, and the spectral color rendering index is poor; and the white light emitted by the white LED in the prior art has a blue light intensity. Large, easy to cause blue light hazard.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present invention provide a white light LED device, a preparation method thereof, and an LED lamp to solve the technical problems of discontinuous spectrum and high blue light intensity of the white light LED device in the prior art.

In a first aspect, an embodiment of the present invention provides a white light LED device, comprising a bracket, a blue light emitting chip disposed on the bracket, and a fluorescent glue covering the blue light emitting chip of the bracket; the fluorescent glue including blue phosphor, yellow-green phosphor and red phosphor, the blue phosphor, yellow-green phosphor and red phosphor are uniformly mixed in the phosphor glue according to a preset ratio;

Wherein, the emission peak wavelength range of the blue phosphor is 470nm-520nm;

The emission peak wavelength range of the yellow-green phosphor powder is 520nm-560nm;

The emission peak wavelength range of the red phosphor powder is 600nm-680nm.

Optionally, in the color temperature range of 4700-6500K, in the wavelength range of 430nm-480nm, the energy intensity ratio range is 70%-120%; in the 480nm-520nm wavelength range, the energy intensity ratio range is 50% %-70%; in the wavelength range of 530nm-580nm, the proportional range of the energy intensity is 45%-65%; in the wavelength range of 600nm-780nm, the proportional range of the energy intensity is 50%-70%.

Optionally, in the color temperature range of 3500-4700K, in the wavelength range of 430nm-480nm, the proportional range of energy intensity is 35%-70%; in the wavelength range of 480nm-520nm, the proportional range of energy intensity is 40 %-60%; in the wavelength range of 530nm-580nm, the proportional range of the energy intensity is 45%-65%; in the wavelength range of 600nm-780nm, the proportional range of the energy intensity is 60%-80%.

Optionally, in the color temperature range of 2700-3500K, in the wavelength range of 430nm-480nm, the proportional range of energy intensity is 20%-40%; in the wavelength range of 480nm-520nm, the proportional range of energy intensity is 35 %-55%; in the wavelength range of 530nm-580nm, the proportional range of the energy intensity is 40%-60%; in the wavelength range of 600nm-780nm, the proportional range of the energy intensity is 70%-95%.

Optionally, in the color temperature range of 1600-2700K, in the wavelength range of 430nm-480nm, the proportional range of energy intensity is 10%-10%; in the wavelength range of 480nm-520nm, the proportional range of energy intensity is 30 %-50%; in the wavelength range of 530nm-580nm, the proportional range of the energy intensity is 50%-70%; in the wavelength range of 600nm-780nm, the proportional range of the energy intensity is 70%-100%.

Optionally, the constituent material of the blue phosphor includes at least one of nitrogen oxide system phosphor powder, aluminate system phosphor powder and silicate system phosphor powder; the constituent material of the yellow-green phosphor powder includes: At least one of aluminate system phosphor powder, β-sialon system phosphor powder and silicate system phosphor powder; the constituent material of the red phosphor powder includes at least one of nitride red powder, oxynitride red powder and sulfide red powder A sort of.

Optionally, the dominant wavelength spectral range of the blue light emitting chip is 430nm-480nm.

In a second aspect, an embodiment of the present invention also provides a method for preparing a white light LED device, including:

provide a stand;

A blue light-emitting chip is arranged on the support;

The fluorescent glue is evenly covered on the blue light emitting chip of the bracket, and the fluorescent glue covers the blue light emitting chip; the fluorescent glue includes blue phosphor, yellow-green phosphor and red phosphor, and the The blue phosphor, the yellow-green phosphor and the red phosphor are uniformly mixed in the phosphor glue according to a preset ratio;

Wherein, the emission peak wavelength range of the blue phosphor is 470nm-520nm;

The emission peak wavelength range of the yellow-green phosphor powder is 520nm-560nm;

The emission peak wavelength range of the red phosphor powder is 600nm-680nm.

Optionally, the fluorescent glue is evenly covered on the blue light emitting chip of the bracket, and the fluorescent glue covers the blue light emitting chip; the fluorescent glue includes blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder. The blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset ratio, including:

uniformly mixing the blue phosphor, yellow-green phosphor and red phosphor with glue according to a preset ratio to form fluorescent glue;

The fluorescent glue is uniformly prepared on one side of the bracket by spraying, spin coating or dispensing, and the fluorescent glue covers the blue light-emitting chip;

The fluorescent glue is cured, and the fluorescent glue covers the blue light emitting chip.

In a third aspect, an embodiment of the present invention further provides an LED lamp, including the white light LED device described in the first aspect.

Compared with the prior art, the beneficial effects of the present invention are:

1. The white light LED device and its preparation method, and the LED lamp provided by the embodiment of the present invention, the fluorescent glue includes blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder are according to The preset ratio is evenly mixed in the fluorescent glue. The fluorescent glue has a strong absorption effect on the blue light emitted by the blue light emitting chip, reducing the intensity of the light emitted by the blue light emitting chip in the entire spectrum and reducing the effect of blue light hazard.

2. The embodiment of the present invention provides a white light LED device, a preparation method thereof, and an LED lamp, and the fluorescent glue includes blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder. It is evenly mixed in the fluorescent glue according to the preset ratio, and the fluorescent glue is excited to emit light by the blue light emitting chip, so as to ensure that the light emitted by the white light LED device has a continuous emission spectrum, and compensate for the spectral loss of the spectrum emitted by the existing white light LED between 480nm and 500nm. This phenomenon ensures that the light emitted by the white LED device has a strong color rendering index.

Description of drawings

In order to illustrate the technical solutions of the exemplary embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in describing the embodiments. Obviously, the introduced drawings are only a part of the drawings of the embodiments to be described in the present invention, rather than all drawings. For those of ordinary skill in the art, without creative work, they can also obtain the drawings according to these drawings. Additional drawings.

1 is a schematic structural diagram of a white light LED device provided by an embodiment of the present invention;

2 is a schematic diagram of an excitation spectrum and an emission spectrum of a blue phosphor in a white light LED device provided by an embodiment of the present invention;

3 is a schematic diagram of the comparison between the luminescence spectrum of the white light LED device provided by the embodiment of the present invention and the luminescence spectrum of the white light LED device in the prior art under the color temperature range of 4700K-6500K;

4 is a schematic diagram of a comparison between the luminescence spectrum of the white light LED device provided by the embodiment of the present invention and the luminescence spectrum of the white light LED device in the prior art after normalization processing under the color temperature range of 4700K-6500K;

5 is a schematic diagram of the comparison between the luminescence spectrum of the white light LED device provided by the embodiment of the present invention and the luminescence spectrum of the white light LED device in the prior art under the color temperature range of 3500K-4700K;

6 is a schematic diagram of the comparison between the luminescence spectrum of the white light LED device provided by the embodiment of the present invention and the luminescence spectrum of the white light LED device in the prior art under the color temperature range of 2700K-3500K;

7 is a schematic diagram showing the comparison between the luminescence spectrum of the white light LED device provided by the embodiment of the present invention and the luminescence spectrum of the white light LED device in the prior art under the color temperature range of 1600K-2700K;

FIG. 8 is a schematic flowchart of a method for manufacturing a white light LED device according to an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be completely described below with reference to the accompanying drawings in the embodiments of the present invention and through specific implementation manners. Obviously, the described embodiments are a part of the embodiments of the present invention, rather than all the embodiments, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work, All fall within the protection scope of the present invention.

The white light LED device provided by the embodiment of the present invention includes a bracket, a blue light emitting chip disposed on the bracket, and a fluorescent glue covering the blue light emitting chip on the bracket; the fluorescent glue includes blue phosphor, yellow-green phosphor and red phosphor , blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder are uniformly mixed in fluorescent glue according to a preset ratio; wherein, the emission peak wavelength range of the blue fluorescent powder is 470nm-520nm; The emission peak wavelength range is 520nm-560nm; the emission peak wavelength range of the red phosphor powder is 600nm-680nm. With the above technical solution, the fluorescent glue includes blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder. The blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent adhesive according to a preset ratio, so as to ensure that the fluorescent adhesive does not interfere with each other. The blue light emitted by the blue light emitting chip has a strong absorption effect, which reduces the intensity of the blue light emitted by the blue light emitting chip in the white light emitted by the entire white light LED device, so as to reduce the harm of blue light. At the same time, the blue light emitting chip is used to excite the fluorescent glue to emit light, so as to ensure that the light emitted by the white light LED device has a continuous emission spectrum, to compensate for the phenomenon of spectral missing between 480nm-500nm in the spectrum emitted by the existing white light LED device, and to ensure that the light emitted by the white light LED device has Strong color rendering index.

The above is the core idea of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

FIG. 1 is a schematic structural diagram of a white light LED device provided by an embodiment of the present invention. As shown in FIG. 1 , the white light LED device provided by an embodiment of the present invention may include: a bracket 10 , a blue light emitting chip 20 disposed on the bracket 10 , and The fluorescent glue 30 covering the blue light emitting chip 20 of the bracket 10; the fluorescent glue 30 includes blue phosphor, yellow-green phosphor and red phosphor, and the blue phosphor, yellow-green phosphor and red phosphor are in a preset ratio Evenly mixed in the fluorescent glue 30;

Among them, the emission peak wavelength range of the blue phosphor is 470nm-520nm;

The emission peak wavelength range of the yellow-green phosphor is 520nm-560nm;

The emission peak wavelength range of the red phosphor is 600nm-680nm.

As shown in FIG. 1, the embodiment of the present invention creatively proposes to include blue phosphors in the fluorescent glue 30. Specifically, the fluorescent glue 30 includes blue phosphors, yellow-green phosphors, and red phosphors. Among them, blue phosphors The emission peak wavelength range of the phosphor can be 470nm-520nm, the emission peak wavelength range of the yellow-green phosphor can be 520nm-560nm, the emission peak wavelength range of the red phosphor can be 600nm-680nm, and the blue light emitting chip 20 main wavelength spectral range It can be 430nm-480nm. When the fluorescent glue 30 including the mixed phosphor powder is excited by using the blue light emitting chip 20, the blue phosphor can absorb the blue light emitted by the blue light emitting chip 20 through the fluorescent glue 30, so as to ensure that the fluorescent glue 30 emits blue light. The blue light emitted by the chip 20 has a strong absorption effect, which reduces the intensity of the light emitted by the blue light emitting chip in the entire spectrum. At the same time, the blue light emitting chip 20 provided by the embodiment of the present invention can excite the blue phosphor to have a strong emission peak in the range of 480nm-520nm, and the emission peak can make up for the lack of blue light in this wavelength band in the emission spectrum of the existing white LED It is guaranteed that the spectrum generated by the white light LED device provided by the embodiment of the present invention is continuous from 430 nm to 780 nm, and there is no problem of missing spectrum in some wavelength bands.

Specifically, as shown in FIG. 2 , FIG. 2 is a schematic diagram of the laser spectrum and emission spectrum of the blue phosphor in the white light LED device provided by the embodiment of the present invention, wherein curve 1 represents the excitation spectrum of the blue phosphor, and curve 2 represents the blue Schematic diagram of the emission spectrum of the color phosphor. From the schematic diagram of the excitation spectrum of the blue phosphor shown in the curve 1 in FIG. 2, it can be known that the blue phosphor has a strong absorption effect in the 440nm-460nm band, and the peak wavelength corresponds to the peak wave of the blue light-emitting chip 20; The blue phosphor is excited by the blue light emitting chip 20 of 430nm-480nm, and the emission spectrum of the blue phosphor can be obtained as shown in curve 2. From curve 2, it can be known that 460nm-540nm corresponds to the light-emitting position of the blue phosphor. Therefore, it can be known from the schematic diagram of the excitation spectrum and emission spectrum of the blue phosphor shown in FIG. 2 that by adding the blue phosphor in the fluorescent glue 30, on the one hand, the blue light emitted by the blue light emitting chip 20 can be absorbed and the blue light emission can be reduced. The blue light emitted by the chip 20 accounts for the intensity of the white light emitted by the entire white light LED device, so that the harm of blue light can be reduced; The lack of this section improves the color rendering effect of the white LED device as a whole.

Optionally, since the luminous efficiencies of different colors of phosphors are different under different color temperature conditions, the embodiments of the present invention do not limit the proportional relationship among the blue phosphors, the yellow-green phosphors, and the red phosphors. The fluorescent powder of the color only needs to meet its emission wavelength range, and the fluorescent glue formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, and reduce the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the entire white LED device. And it is enough to ensure that the spectrum of the white light LED device is continuous.

Optionally, the constituent substances of the blue phosphors may include at least one of nitrogen oxide phosphors, aluminates phosphors, and silicate phosphors; the constituents of the yellow-green phosphors may be Including at least one of aluminate system phosphor powder, β-sialon system phosphor powder and silicate system phosphor powder; the constituent material of red phosphor powder may include at least one of nitride red powder, oxynitride red powder and sulfide red powder A sort of. It should be noted that the constituent substances of the blue phosphor, yellow-green phosphor and red phosphor include but are not limited to the above-mentioned materials, as long as the constituent substances of the phosphors of each color conform to the corresponding specified wavelength range.

Optionally, the dominant wavelength spectral range of the blue light emitting chip 20 provided by the embodiment of the present invention may be 430nm-480nm, which may be a single-band spectrum, for example, a single-band spectrum with a dominant wavelength spectral range of 430nm-480nm; or a two-band spectrum. Spectral mixing of more than one wavelength band is obtained, for example, the spectral ranges of the dominant wavelength are 430 nm-450 nm and 450 nm-480 nm, respectively, which are not limited in the embodiment of the present invention.

Optionally, with continued reference to FIG. 1 , the blue light emitting chip 20 provided by the embodiment of the present invention may be a flip chip or a positive chip; and the bracket 10 includes an electrical connection portion (not shown in the figure) on the bracket 10 . When the blue light emitting chip 20 is a flip chip, the blue light emitting chip 20 is directly electrically connected to the electrical connection part on the bracket 10 to obtain the voltage signal provided by the electrical connection part to drive the blue light emitting chip 20 to emit light; when the blue light emitting chip 20 is installed When the chip is used, the blue light emitting chip 20 needs to be electrically connected with the electrical connection part on the bracket 10 by means of wire bonding to obtain the voltage signal provided by the electrical connection part to drive the blue light emitting chip 20 to emit light. Optionally, when the blue light-emitting chip 20 is a positive chip and needs to be electrically connected to the electrical connection part on the bracket by means of wire bonding, it can be electrically connected by one bonding wire or two bonding wires. This is not limited. FIG. 1 only takes the blue light emitting chip 20 as a positive chip, and the blue light emitting chip 20 is electrically connected to the electrical connection part on the bracket 10 through two bonding wires 40 for illustrative illustration. 1 , the white LED device provided by the embodiment of the present invention may further include an insulating block 50 located in the bracket 10 . The insulating block 50 is used to isolate the positive electrode and the negative electrode to ensure that the blue light emitting chip 20 emits normally.

The following is a detailed description of the white light LED device provided by the embodiment of the present invention and the existing The beneficial effects of white light LED devices in the technology are compared.

3 is a schematic diagram showing the comparison between the emission spectrum of the white light LED device provided by the embodiment of the present invention and the emission spectrum of the white light LED device in the prior art under the color temperature range of 4700K-6500K, wherein the curve 3 represents the white light provided by the embodiment of the present invention. A schematic diagram of an absolute luminescence spectrum of an LED device, and curve 4 represents a schematic diagram of an absolute luminescence spectrum of a white light LED device in the prior art. As shown in FIG. 3 , in the spectral range of the blue light emitting chip 20 from 430 nm to 480 nm, the luminous intensity of the blue light in the curve 3 is less than the luminous intensity of the blue light in the curve 4. Specifically, it can be in the spectral range of 430 nm to 480 nm. For example, the blue light emission intensity of the white LED is about 60% of that of the prior art white LED, which greatly reduces the blue light emission intensity of the blue light emitting chip 20 in the entire spectrum and reduces the blue light hazard. The problem that the blue light intensity is relatively large and the blue light pollution is relatively serious in the existing white light LED device is solved.

4 is a schematic diagram of a comparison between the luminescence spectrum of the white light LED device provided by the embodiment of the present invention and the luminescence spectrum of the white light LED device in the prior art under the color temperature range of 4700K-6500K after normalization processing, wherein the curve 6 represents the present invention The schematic diagram of the normalized luminescence spectrum of the white light LED device provided in the embodiment, the curve 7 represents the schematic diagram of the normalized luminescence spectrum of the white light LED device in the prior art. As shown in FIG. 4 , the emission spectrum of the white light LED device provided by the embodiment of the present invention has a strong emission peak in the range of 480nm-520nm, and the emission peak can make up for the lack of blue light in the emission spectrum of the existing white light LED in this band. It is guaranteed that the spectrum generated by the white light LED device provided by the embodiment of the present invention is continuous from 430 nm to 780 nm, and there is no problem of missing spectrum in some wavelength bands. At the same time, the continuous emission spectrum can also achieve a good color rendering effect.

Optionally, continue to refer to FIG. 3 . Curve 5 in FIG. 3 represents a schematic diagram of the spectrum of saturated blue. It can be seen from the figure that the emission spectrum of the white LED device provided by the embodiment of the present invention is close to the spectrum of saturated blue. There is a strong emission peak around 480 nm, so the white LED device provided by the embodiment of the present invention can make up for the technical problem of the loss of saturated blue, and solve the defect that the light emitted by the existing white LED device has a loss of saturated blue brightness.

Optionally, the color rendering indices R1-R15 of the white light LED device provided by the embodiment of the present invention are all greater than 90, and the color difference from the color under natural illumination is small, and the color rendering effect is good.

Optionally, within the color temperature range of 4700K-6500K, the proportion of blue phosphors in the fluorescent glue 30 ranges from 5% to 15%, the proportion of yellow-green phosphors ranges from 80% to 90%, and the proportion of red phosphors is in the range of 5% to 15%. The range is 1%-6%. In the color temperature range of 4700K-6500K, set the ratio of blue phosphors to 5%-15%, yellow-green phosphors to 80%-90%, and red phosphors to 1%-6% , to ensure that the fluorescent glue 30 formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, reduce the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the entire white light LED device, and ensure that the white light LED device emits a continuous spectrum. Good color rendering.

It can be understood that the % provided in the embodiments of the present invention refers to mass percentage.

It should be noted that FIG. 3 only illustrates an luminescence spectrum diagram of the white light LED device provided by the embodiment of the present invention under the color temperature range of 4700K-6500K. It can be understood that under the color temperature range of 4700K-6500K, the The white light LED devices provided in the examples have multiple possible emission spectra, and Table 1 describes the energy intensities of the emission spectra in different wavelength ranges and the preferred energy intensities.

Table 1 Energy intensity distribution of white LED devices in different wavelength ranges under the color temperature range of 4700K-6500K

Wavelength range (nm) energy intensity Preferred energy intensity 430-480 70%-120% 80%-110% 480-520 50%-70% 55%-65% 530-580 45%-65% 50%-60% 600-780 50%-70% 55K-65%

It can be understood that in the color temperature range of 4700K-6500K, when the energy range of the white light emitted by the white LED device is within the energy intensity range described in Table 1, it falls within the protection scope of the embodiment of the present invention. It should be noted that , the energy intensity described in the above table represents the absolute energy value of the luminescence spectrum. Due to the difference of the measurement system, the above four independent wavelength ranges can be increased in the same proportion.

5 is a schematic diagram showing the comparison between the emission spectrum of the white light LED device provided by the embodiment of the present invention and the emission spectrum of the white light LED device in the prior art under the color temperature range of 3500K-4700K, wherein the curve 8 represents the white light provided by the embodiment of the present invention. A schematic diagram of an absolute luminescence spectrum of an LED device, and curve 9 represents a schematic diagram of an absolute luminescence spectrum of a white LED device in the prior art. As shown in FIG. 5 , in the spectral range of the blue light emitting chip 20 from 430 nm to 480 nm, the luminous intensity of the blue light in the curve 8 is less than the luminous intensity of the blue light in the curve 9, which greatly reduces the blue light emitted by the blue light emitting chip 20 in the entire spectrum. Luminous intensity, reducing blue light hazard. At the same time, the emission spectrum of the white light LED device provided by the embodiment of the present invention has a strong emission peak in the range of 480nm-520nm. The spectrum generated by the white light LED device provided by the embodiment of the invention is continuous from 430 nm to 780 nm, and there is no problem of missing spectrum in certain wavelength bands. At the same time, the continuous emission spectrum can also achieve a good color rendering effect.

Optionally, in the color temperature range of 3500K-4700K, the proportion of blue phosphors in the fluorescent glue 30 ranges from 10% to 20%, the proportion of yellow-green phosphors ranges from 75% to 90%, and the proportion of red phosphors is in the range of 75% to 90%. The range is 3%-8%. In the color temperature range of 3500K-4700K, set the proportion of blue phosphors to 10%-20%, yellow-green phosphors to 75%-90%, and red phosphors to 3%-8% , to ensure that the fluorescent glue 30 formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, reduce the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the entire white light LED device, and ensure that the white light LED device emits a continuous spectrum. Good color rendering.

It should be noted that FIG. 5 only illustrates a luminescence spectrum diagram of the white light LED device provided by the embodiment of the present invention under the color temperature range of 3500K-4700K. It can be understood that under the color temperature range of 3500K-4700K, the The white light LED device provided by the embodiment may have multiple possible emission spectrum diagrams, and Table 2 describes the energy intensity of the emission spectrum in different wavelength ranges and the preferred energy intensity.

Table 2 Energy intensity distribution of white LED devices in different wavelength ranges under the color temperature range of 3500K-4700K

It can be understood that, in the color temperature range of 3500K-4700K, when the energy range of the white light emitted by the white LED device is within the energy intensity range described in Table 2, it falls within the protection scope of the embodiment of the present invention. It should be noted that , the energy intensity described in the above table represents the absolute energy value of the luminescence spectrum. Due to the difference of the measurement system, the above four independent wavelength ranges can be increased in the same proportion.

6 is a schematic diagram showing the comparison between the emission spectrum of the white light LED device provided by the embodiment of the present invention and the emission spectrum of the white light LED device in the prior art under the color temperature range of 2700K-3500K, wherein the curve 10 represents the white light provided by the embodiment of the present invention. A schematic diagram of an absolute luminescence spectrum of an LED device, and curve 11 represents a schematic diagram of an absolute luminescence spectrum of a white LED device in the prior art. As shown in FIG. 6 , in the spectral range of the blue light emitting chip 20 from 430 nm to 480 nm, the luminous intensity of the blue light in the curve 10 is less than the luminous intensity of the blue light in the curve 11, which can reduce the emission of the blue light emitted by the blue light emitting chip 20 in the entire spectrum. Intensity, reducing blue light hazards. At the same time, the luminescence spectrum of the white light LED device provided by the embodiment of the present invention has an emission peak in the range of 480nm-520nm, and the emission peak can make up for the defect that the luminescence spectrum of the existing white light LED lacks blue light in this band, ensuring the embodiment of the present invention. The spectrum generated by the provided white light LED device after laser is continuous from 430nm-780nm, and there is no problem of missing spectrum in some bands. At the same time, the continuous emission spectrum can also achieve a good color rendering effect.

Optionally, within the color temperature range of 2700K-3500K, the proportion of blue phosphors in the fluorescent glue 30 ranges from 12% to 22%, the proportion of yellow-green phosphors ranges from 70% to 80%, and the proportion of red phosphors ranges from 70% to 80%. The range is 5%-11%. In the color temperature range of 2700K-3500K, set the proportion of blue phosphors to 12%-22%, yellow-green phosphors to 70%-80%, and red phosphors to 5%-11% , to ensure that the fluorescent glue 30 formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, reduce the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the entire white light LED device, and ensure that the white light LED device emits a continuous spectrum. Good color rendering.

It should be noted that FIG. 6 only illustrates an emission spectrum diagram of the white light LED device provided by the embodiment of the present invention in the color temperature range of 2700K-3500K. It can be understood that in the color temperature range of 2700K-3500K, the present invention The white light LED device provided by the embodiment may have multiple possible emission spectrum diagrams, and Table 3 describes the energy intensity of the emission spectrum in different wavelength ranges and the preferred energy intensity.

Table 3 Energy intensity distribution of white LED devices in different wavelength ranges under the color temperature range of 2700K-3500K

Wavelength range (nm) energy intensity Preferred energy intensity 430-480 20%-40% 25%-35% 480-520 35%-55% 40%-50% 530-580 40%-60% 45%-55% 600-780 70%-95% 75%-85%

It can be understood that under the color temperature range of 2700K-3500K, when the energy range of the white light emitted by the white LED device is within the energy intensity range described in Table 3, it falls within the protection scope of the embodiment of the present invention. It should be noted that , the energy intensity described in the above table represents the absolute energy value of the luminescence spectrum. Due to the difference of the measurement system, the above four independent wavelength ranges can be increased in the same proportion.

7 is a schematic diagram showing the comparison between the emission spectrum of the white light LED device provided by the embodiment of the present invention and the emission spectrum of the white light LED device in the prior art under the color temperature range of 1600K-2700K, wherein the curve 12 represents the white light provided by the embodiment of the present invention. A schematic diagram of the absolute luminescence spectrum of the LED device, and curve 13 represents a schematic diagram of the absolute luminescence spectrum of the white light LED device in the prior art. As shown in FIG. 7 , at the spectral center position of the blue light emitting chip 20 at 450 nm, the luminous intensity of the blue light in the curve 12 is lower than the luminous intensity of the blue light in the curve 13, which can reduce the luminous intensity of the blue light emitted by the blue light emitting chip 20 in the entire spectrum. , reducing blue light hazard. At the same time, the luminescence spectrum of the white light LED device provided by the embodiment of the present invention has an emission peak in the range of 480nm-520nm, and the emission peak can make up for the defect that the luminescence spectrum of the existing white light LED lacks blue light in this band, ensuring the embodiment of the present invention. The spectrum generated by the provided white light LED device after laser is continuous from 430nm-780nm, and there is no problem of missing spectrum in some bands. At the same time, the continuous emission spectrum can also achieve a good color rendering effect.

Optionally, within the color temperature range of 1600K-2700K, the proportion of blue phosphors in the fluorescent glue 30 ranges from 14% to 24%, the proportion of yellow-green phosphors ranges from 70% to 80%, and the proportion of red phosphors ranges from 70% to 80%. 8%-14%. In the color temperature range of 1600K-2700K, set the ratio of blue phosphor to 14%-24%, the ratio of yellow-green phosphor to 70%-80%, and the ratio of red to 6%-14% , to ensure that the fluorescent glue 30 formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, reduce the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the entire white light LED device, and ensure that the white light LED device emits a continuous spectrum. Good color rendering.

It should be noted that FIG. 7 only illustrates an emission spectrum of the white light LED device provided by the embodiment of the present invention in the color temperature range of 1600K-2700K. It can be understood that in the color temperature range of 1600K-2700K, the present invention The white light LED device provided by the embodiment may have multiple possible emission spectrum diagrams, and Table 4 describes the energy intensity of the emission spectrum in different wavelength ranges and the preferred energy intensity.

Table 4 Energy intensity distribution of white LED devices in different wavelength ranges under the color temperature range of 1600K-2700K

It can be understood that, in the color temperature range of 1600K-2700K, when the energy range of the white light emitted by the white LED device is within the energy intensity range described in Table 4, it falls within the protection scope of the embodiment of the present invention. It should be noted that , the energy intensity described in the above table represents the absolute energy value of the luminescence spectrum. Due to the difference of the measurement system, the above four independent wavelength ranges can be increased in the same proportion.

Optionally, FIG. 8 is a schematic flowchart of a method for preparing a white light LED device provided by an embodiment of the present invention. An embodiment of the present invention also provides a method for preparing a white light LED device, which is used for preparing the white light LED device provided by the embodiment of the present invention. A white light LED device, as shown in FIG. 8 , a method for preparing a white light LED device provided by an embodiment of the present invention may include:

S110. Provide a bracket.

S120, disposing a blue light emitting chip on the support.

Optionally, the blue light emitting chip can be a flip chip or a positive chip. When the blue light emitting chip is a flip chip, the blue light emitting chip is directly electrically connected to the electrical connection part on the bracket to obtain the voltage signal provided by the electrical connection part. , drive the blue light emitting chip to emit light; when the blue light emitting chip is a positive chip, the blue light emitting chip needs to be electrically connected with the electrical connection part on the bracket by means of wire bonding, obtain the voltage signal provided by the electrical connection part, and drive the blue light emitting chip. glow. Optionally, when the blue light-emitting chip is a positive chip and needs to be electrically connected to the electrical connection part on the bracket by means of wire bonding, it can be electrically connected by one bonding wire or two bonding wires. Not limited.

S130, uniformly covering the blue light emitting chip of the bracket with fluorescent glue, and the fluorescent glue covers the blue light emitting chip; the fluorescent glue includes blue phosphor, yellow-green phosphor and red phosphor, The blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset ratio.

Exemplarily, the fluorescent glue is uniformly covered on the blue light emitting chip of the bracket, the fluorescent glue covers the blue light emitting chip, and the blue light emitted by the blue light emitting chip excites the fluorescent powder in the fluorescent glue to emit light. Optionally, the emission peak wavelength range of the blue fluorescent powder is 470nm-520nm; the emission peak wavelength range of the yellow-green fluorescent powder is 520nm-560nm; the emission peak wavelength range of the red fluorescent powder is 600nm-680nm .

In the method for preparing a white light LED device provided by the embodiment of the present invention, the blue light-emitting chip is covered by a fluorescent glue including blue phosphor, yellow-green phosphor and red phosphor, so as to ensure that the fluorescent glue has a strong effect on the blue light emitted by the blue light-emitting chip. The absorption effect of the blue light emitting chip reduces the intensity of the blue light emitted by the blue light emitting chip in the white light emitted by the entire white LED device, so as to reduce the harm of blue light. At the same time, the blue light emitting chip is used to excite the fluorescent glue to emit light, so as to ensure that the light emitted by the white light LED device has a continuous emission spectrum, to compensate for the phenomenon of spectral missing between 480nm-500nm in the spectrum emitted by the existing white light LED device, and to ensure that the light emitted by the white light LED device has Strong color rendering index.

Optionally, the fluorescent glue is evenly covered on the blue light emitting chip of the bracket, and the fluorescent glue covers the blue light emitting chip; the fluorescent glue includes blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder. The blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset ratio, including:

uniformly mixing the blue phosphor, yellow-green phosphor and red phosphor with glue according to a preset ratio to form fluorescent glue;

The fluorescent glue is uniformly prepared on one side of the bracket by spraying, spin coating or dispensing, and the fluorescent glue covers the blue light-emitting chip;

The fluorescent glue is cured, and the fluorescent glue covers the blue light emitting chip.

Exemplarily, the blue phosphor, the yellow-green phosphor and the red phosphor are uniformly mixed with glue according to a preset ratio, and after the phosphor glue is formed, the phosphor glue can also be subjected to centrifugal defoaming treatment to remove air bubbles in the liquid crystal of the phosphor glue. , The mixed fluorescent glue is uniformly prepared inside the bracket by spraying, spin coating or dispensing, and then it can be left for a period of time, and then put into an oven to harden, so that the fluorescent glue is cured, and the fluorescent glue covers the blue light-emitting chip.

Optionally, an embodiment of the present invention further provides an LED lamp, which includes the LED device described in the above-mentioned embodiments of the present invention, and has the beneficial effects of the LED device, which will not be repeated here.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (7)

1. A white LED device, comprising: the LED lamp comprises a bracket, a blue light emitting chip arranged on the bracket and fluorescent glue covering the blue light emitting chip of the bracket; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion;

wherein the emission peak wavelength range of the blue fluorescent powder is 470-520 nm;

the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm;

the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm;

the excitation peak wavelength of the blue fluorescent powder corresponds to the peak wavelength of the blue light emitting chip;

in the color temperature range of 3500K-4700K and the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 35% -70%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 40% -60%; the proportion range of the energy intensity is 45-65% in the wavelength range of 530nm-580 nm; in the wavelength range of 600nm-780nm, the proportion range of the energy intensity is 60% -80%; in a color temperature range of 3500K-4700K, in a light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder;

in the color temperature range of 2700K-3500K, in the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 20% -40%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 35% -55%; the proportion range of the energy intensity is 40-60% in the wavelength range of 530-580 nm; the proportion range of the energy intensity is 70-95% in the wavelength range of 600-780 nm; in the color temperature range of 2700K-3500K, in the light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder;

in the color temperature range of 1600K-2700K and the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 10% -10%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 30% -50%; the proportion range of the energy intensity is 50 to 70 percent within the wavelength range of 530nm to 580 nm; in the wavelength range of 600nm-780nm, the proportion range of the energy intensity is 70% -100%; and in the color temperature range of 1600K-2700K, in the light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder.

2. The white LED device of claim 1, wherein the proportion of energy intensity in the wavelength range of 430nm to 480nm is in the range of 70% to 120% in the range of color temperature of 4700K to 6500K; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 50% -70%; the proportion range of the energy intensity is 45-65% in the wavelength range of 530nm-580 nm; the proportion range of the energy intensity is 50 to 70 percent within the wavelength range of 600 to 780 nm.

3. The white LED device according to claim 1, wherein the blue phosphor comprises at least one of a nitrogen oxide phosphor, an aluminate phosphor and a silicate phosphor, the yellow-green phosphor comprises at least one of an aluminate phosphor, an β -sialon phosphor and a silicate phosphor, and the red phosphor comprises at least one of a nitride red, a nitrogen oxide red and a sulfide red.

4. The white LED device of claim 1, wherein the blue light emitting chip has a dominant wavelength in the spectral range of 430nm to 480 nm.

5. A preparation method of a white light LED device is characterized by comprising the following steps:

providing a bracket;

arranging a blue light emitting chip on the bracket;

uniformly covering fluorescent glue on the blue light emitting chip of the bracket, wherein the blue light emitting chip is coated by the fluorescent glue; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion;

wherein the emission peak wavelength range of the blue fluorescent powder is 470-520 nm;

the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm;

the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm;

in the color temperature range of 3500K-4700K and the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 35% -70%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 40% -60%; the proportion range of the energy intensity is 45-65% in the wavelength range of 530nm-580 nm; in the wavelength range of 600nm-780nm, the proportion range of the energy intensity is 60% -80%; in a color temperature range of 3500K-4700K, in a light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder;

in the color temperature range of 2700K-3500K, in the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 20% -40%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 35% -55%; the proportion range of the energy intensity is 40-60% in the wavelength range of 530-580 nm; the proportion range of the energy intensity is 70-95% in the wavelength range of 600-780 nm; in the color temperature range of 2700K-3500K, in the light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder;

in the color temperature range of 1600K-2700K and the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 10% -10%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 30% -50%; the proportion range of the energy intensity is 50 to 70 percent within the wavelength range of 530nm to 580 nm; in the wavelength range of 600nm-780nm, the proportion range of the energy intensity is 70% -100%; and in the color temperature range of 1600K-2700K, in the light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder.

6. The method for manufacturing a white light LED device according to claim 5, wherein a fluorescent glue is uniformly coated on the blue light emitting chip of the support, and the blue light emitting chip is coated by the fluorescent glue; the fluorescent glue contains blue phosphor powder, yellow-green phosphor powder and red phosphor powder, blue phosphor powder, yellow-green phosphor powder and red phosphor powder according to the predetermined proportion evenly mix in the fluorescent glue, include:

uniformly mixing the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder with glue according to a preset proportion to form fluorescent glue;

uniformly preparing the fluorescent glue on one side of the bracket by adopting spraying, spin coating or a glue dispensing mode, wherein the blue light emitting chip is covered by the fluorescent glue;

and curing the fluorescent glue, wherein the blue light emitting chip is coated by the fluorescent glue.

7. An LED lamp comprising the white LED device of any one of claims 1 to 4.

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